Laserfiche WebLink
YOY CHUB LENGTH FREQUENCIES <br />1993 <br />40 ,~~Ym <br />f <br />NA7CI[J[A.Y67 <br />30 ----__.. ; <br />S ~ "---.-..._ <br />~..~ <br />..,~~~ <br />20 -_ , ~ ----..._. <br />~ .. <br />."..- <br />~. <br />`•--._.. <br />---... <br />~~~ <br />10 ;,;;; ; <br />,;; -, , <br />,;,; ;,,, <br />...._.~ <br />__ <br />,_ <br />:, <br />IiA1Qt 11A.Y 13 <br />10 15 ~~~~~~~_~~~ <br />25 ~ ~. <br />TOTAL LENGTH (mmf 0 35 <br />i <br />Figure 3. • • Length frequency analysis of .YOY chubs collected on two dates in 1993 depicting the <br />bi-modal distn~bution and associated back calculated hatching dates. Collections from the above <br />canyon and canyon sub-reaches. - <br />There were strong correlaxions (Pearson) found between earliest hatching dates and a. pre-peak <br />flow (>6000cfs) days (r~.9881~nd b. pre-peak degree (>10°G~ days (rz = ().9778) in <br />Westwater Canyon, i.e. the more flow we saw on the ascending limb of the hydrograph the later <br />chubs spawned. The flow vs hatch date correlation was significant (p < 0.05), however the <br />temperature relationship was not (p = 0.087). A similar analysis of the above Westwater data <br />yielded a weak positive relationship, compromised by the 1993 data point (early hatch and high <br />water) and no YOY collected there in 1995 (Figure 4). <br />10 <br />